package com.webcamtracker.ui.utils;

import javax.imageio.ImageIO;
import javax.swing.*;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.awt.image.ColorModel;
import java.awt.image.MemoryImageSource;
import java.awt.image.PixelGrabber;
import java.io.File;
import java.io.IOException;


public class ImageUtils {
    private static final String JPG = "jpg";

    // This method returns a buffered image with the contents of an image
    public static BufferedImage toBufferedImage(Image image) {
        if (image instanceof BufferedImage) {
            return (BufferedImage) image;
        }

        // This code ensures that all the pixels in the image are loaded
        image = new ImageIcon(image).getImage();

        // Determine if the image has transparent pixels; for this method's
        // implementation, see e661 Determining If an Image Has Transparent Pixels
        boolean hasAlpha = hasAlpha(image);

        // Create a buffered image with a format that's compatible with the screen
        BufferedImage bimage = null;
        GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
        try {
            // Determine the type of transparency of the new buffered image
            int transparency = Transparency.OPAQUE;
            if (hasAlpha) {
                transparency = Transparency.BITMASK;
            }

            // Create the buffered image
            GraphicsDevice gs = ge.getDefaultScreenDevice();
            GraphicsConfiguration gc = gs.getDefaultConfiguration();
            bimage = gc.createCompatibleImage(
                    image.getWidth(null), image.getHeight(null), transparency);
        } catch (HeadlessException e) {
            // The system does not have a screen
        }

        if (bimage == null) {
            // Create a buffered image using the default color model
            int type = BufferedImage.TYPE_INT_RGB;
            if (hasAlpha) {
                type = BufferedImage.TYPE_INT_ARGB;
            }
            bimage = new BufferedImage(image.getWidth(null), image.getHeight(null), type);
        }

        // Copy image to buffered image
        Graphics g = bimage.createGraphics();

        // Paint the image onto the buffered image
        g.drawImage(image, 0, 0, null);
        g.dispose();

        return bimage;
    }

    public static BufferedImage clone(BufferedImage toClone) {
        PixelGrabber pg = new PixelGrabber(toClone, 0, 0, -1, -1, true);

        try {
            pg.grabPixels();
        }
        catch (InterruptedException e) {
            e.printStackTrace();
        }

        int[] raster = (int[]) pg.getPixels();


        MemoryImageSource memoryimagesource =
                new MemoryImageSource(pg.getWidth(), pg.getHeight(), raster, 0, pg.getWidth());
        return toBufferedImage(Toolkit.getDefaultToolkit().createImage(memoryimagesource));

    }

    public static boolean hasAlpha(Image image) {
        // If buffered image, the color model is readily available
        if (image instanceof BufferedImage) {
            BufferedImage bimage = (BufferedImage) image;
            return bimage.getColorModel().hasAlpha();
        }

        // Use a pixel grabber to retrieve the image's color model;
        // grabbing a single pixel is usually sufficient
        PixelGrabber pg = new PixelGrabber(image, 0, 0, 1, 1, false);
        try {
            pg.grabPixels();
        } catch (InterruptedException e) {
        }

        // Get the image's color model
        ColorModel cm = pg.getColorModel();
        return cm.hasAlpha();
    }

    public static void storeImage(BufferedImage image, String id) {
        // Write generated image to a file
        try {
            // Save as JPEG
            File file = new File(id + "." + JPG);
            ImageIO.write(image, JPG, file);
        } catch (IOException e) {
            e.printStackTrace();
        }
        // Returns a generated image.
    }

    public static BufferedImage loadImage(String id) {
        Image image = null;
        try {
            // Read from a file
            File file = new File(id + "." + JPG);
            image = ImageIO.read(file);
        } catch (IOException e) {
            e.printStackTrace();
        }
        return toBufferedImage(image);
    }

}
